CN115236984A - Pellet rotary kiln temperature control method and device - Google Patents
Pellet rotary kiln temperature control method and device Download PDFInfo
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Abstract
The invention provides a temperature control method and a temperature control device for a pellet rotary kiln, wherein the temperature control method comprises the following steps: determining a set value of the coal feeding amount of a coal feeder, determining a current material thickness average value of a chain grate, summing the current material thickness average value of the chain grate, a real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of a rotary kiln, which are obtained by value taking for a plurality of times, and then respectively taking a moving average value; obtaining a coal feeding amount correction coefficient according to the moving average value of the current material thickness of the chain grate, the average value of the real-time feedback value of the coal feeding amount, the moving average value of the current machine speed of the chain grate and the moving average value of the kiln tail temperature of the rotary kiln; and obtaining a final coal feeding amount according to the coal feeding amount correction coefficient, limiting the final coal feeding amount, performing closed-loop adjustment on the limited coal feeding amount and temperature, and adjusting the coal feeding amount of the coal feeder within a third preset time period every hour. The invention solves the problem that the automatic control of the coal feeding quantity can not be implemented, and realizes the automatic control mode of the temperature of the rotary pellet kiln.
Description
Technical Field
The invention belongs to the technical field of automatic coal feeding control, and particularly relates to a temperature control method and device for a pellet rotary kiln.
Background
In the existing method for controlling the temperature of the pellet rotary kiln, a coal feeding quantity quantitative given control mode of a coal mill is generally used. According to the requirements of the process, the temperature of the rotary kiln is adjusted by quantitatively setting the coal injection quantity, so that great instability factors exist, and great waste is caused. Because the temperature regulation of the rotary kiln has the characteristic of large lag, the fluctuation regulation instability phenomenon exists in the regulation process of the simple closed-loop control. Therefore, the development of a method and an apparatus for controlling the temperature of a pellet rotary kiln can effectively overcome the above-mentioned drawbacks in the related art, and is a technical problem to be solved in the industry.
Disclosure of Invention
Based on the defects of the prior art, the technical problem to be solved by the invention is to provide a method and a device for controlling the temperature of a pellet rotary kiln.
In a first aspect, an embodiment of the present invention provides a pellet rotary kiln temperature control method, including: determining a set value of the coal feeding amount of a coal feeder, determining a current material thickness average value of a chain grate, and taking values of the current material thickness average value of the chain grate, a real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of a rotary kiln at intervals of a first preset time, wherein the values are continuously taken for a plurality of times; respectively summing the average value of the current material thickness of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln obtained by the value taking for a plurality of times, and then respectively taking a moving average value; obtaining a coal feeding amount correction coefficient according to the moving average value of the current material thickness of the chain grate, the average value of the real-time feedback value of the coal feeding amount, the moving average value of the current machine speed of the chain grate and the moving average value of the kiln tail temperature of the rotary kiln; and obtaining a final coal feeding amount according to the coal feeding amount correction coefficient, limiting the final coal feeding amount, performing closed-loop adjustment on the limited coal feeding amount and temperature, and adjusting the coal feeding amount of the coal feeder within a third preset time period once per hour.
On the basis of the content of the method embodiment, the method for controlling the temperature of the rotary kiln for pellets provided by the embodiment of the invention is characterized in that the average value of the current material thickness of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the temperature of the kiln tail of the rotary kiln are respectively valued every other first preset time, and the continuous value is continuously valued for a plurality of times, and comprises the following steps: and respectively taking data for the current average material thickness of the chain grate, the real-time feedback value of the coal feeding quantity, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln at intervals of 5 seconds for mobile storage, and continuously and respectively storing 12 groups of data.
Optionally, the obtaining a coal feeding amount correction coefficient according to a moving average value of a current material thickness of the grate, an average value of a real-time feedback value of the coal feeding amount, a moving average value of a current machine speed of the grate and a moving average value of a kiln tail temperature of the rotary kiln includes:
wherein L is cur Is the moving average of the current material thickness of the grate, speed cur Is the moving average of the current machine Speed of the grate, speed cur-1 Is a moving average of the cycle speed on the grate, L cur-1 Is a moving average of the material thickness of a cycle on the grate, M cur Weight of green pellets entering the kiln end, M cur-1 Weight of green pellets entering the kiln end for the previous cycle, T aim Is the rotary kiln temperature set point, T cur-1 The moving average value of the kiln tail temperature of the rotary kiln in the previous period is shown, and K is a coal feeding quantity correction coefficient.
Further, the obtaining of the final coal feeding amount according to the coal feeding amount correction coefficient includes:
Q＝KW cur-1
wherein Q is the final coal feed, W cur-1 The average value of the real-time feedback values of the coal feeding amount in the previous period is obtained.
Further, the defining the final coal feeding amount comprises: the range of the coal feeding amount set value during normal production is more than or equal to 5 tons/hour and less than or equal to 7 tons/hour, and the coal feeding amount set value is calibrated to prevent misoperation.
Optionally, the limited coal feeding amount and temperature are controlledA closed loop regulation, comprising: if T cur -5℃<T aim <T cur +5 ℃ and Q +0.0 ton/hour; if T cur +5℃≤T aim <T cur +10 ℃ and Q-0.1 ton/h; if T is cur +10℃≤T aim <T cur +15 ℃ and Q-0.2 ton/h; if T cur +15℃≤T aim Q-0.3 ton/h; if T cur -10℃<T aim ≤T cur Q +0.1 ton/h at-5 ℃; if T is cur -10℃≤T aim <T cur Q +0.2 ton/h at-15 ℃; if T aim ≤T cur Q +0.3 ton/h at-15 ℃; t is a unit of cur Is a moving average of the kiln tail temperature of the rotary kiln.
Further, after the amount of coal fed to the coal feeder per hour is adjusted within a third predetermined time period, the method further comprises: when the annular cooler is blocked, the DCS or the PLC system automatically gives an alarm, an expert is provided to give an operation worker leader, a command is automatically delayed and sent after adjustment is confirmed or not confirmed, and the rotary kiln is delayed to rotate at a low kiln speed; when the coal feeding amount feedback is smaller than a set value, the DCS or the PLC system automatically gives an alarm, an expert is proposed to give an operation worker leader, a command is automatically sent out in a delayed mode after adjustment or unconfirmation, and the rotary kiln rotates at a low speed in a delayed mode; when the speed of the chain grate machine is less than the set value, the DCS or the PLC system automatically gives an alarm, an expert is provided to give an operation worker leader, the command is automatically delayed and sent out after the regulation is confirmed or not, and the rotary kiln rotates at a low speed in a delayed manner.
In a second aspect, an embodiment of the present invention provides a pellet rotary kiln temperature control device, including: the first main module is used for determining a set value of the coal feeding amount of the coal feeder, determining a current material thickness average value of the chain grate, and respectively taking values of the current material thickness average value of the chain grate, a real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln every first preset time, and continuously taking the values for a plurality of times; the second main module is used for respectively summing the current material thickness average value of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln which are obtained by value taking for a plurality of times and then respectively taking a moving average value; the third main module is used for obtaining a coal feeding quantity correction coefficient according to the moving average value of the current material thickness of the chain grate, the average value of the real-time feedback value of the coal feeding quantity, the moving average value of the current machine speed of the chain grate and the moving average value of the kiln tail temperature of the rotary kiln; and the fourth main module is used for obtaining the final coal feeding amount according to the coal feeding amount correction coefficient, limiting the final coal feeding amount, performing closed-loop adjustment on the limited coal feeding amount and temperature, and adjusting the coal feeding amount of the coal feeder within a third preset time period.
The temperature control method and the temperature control device for the rotary pellet kiln solve the problems of inaccurate judgment, untimely adjustment and large adjustment range caused by manual experience operation, reduce the labor intensity of operators, improve the labor efficiency, solve the problem that the automatic control of coal feeding amount cannot be implemented due to uncontrollable real-time temperature change, and realize the automatic temperature control mode of the rotary pellet kiln.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given with reference to the preferred embodiments in conjunction with the accompanying drawings.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below to the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling the temperature of a rotary pellet kiln according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a temperature control device of a pellet rotary kiln according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. In addition, technical features of various embodiments or individual embodiments provided by the present invention may be arbitrarily combined with each other to form a feasible technical solution, and such combination is not limited by the sequence of steps and/or the structural composition mode, but must be realized by a person skilled in the art, and when the technical solution combination is contradictory or cannot be realized, such a technical solution combination should not be considered to exist and is not within the protection scope of the present invention.
The embodiment of the invention provides a temperature control method of a pellet rotary kiln, and referring to fig. 1, the method comprises the following steps: determining a set value of the coal feeding amount of a coal feeder, determining a current material thickness average value of a chain grate, and taking values of the current material thickness average value of the chain grate, a real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of a rotary kiln at intervals of a first preset time, wherein the values are continuously taken for a plurality of times; respectively summing the current material thickness average value of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln obtained by value taking for a plurality of times, and then respectively taking a moving average value; obtaining a coal feeding amount correction coefficient according to a moving average value of the current material thickness of the chain grate, an average value of real-time feedback values of the coal feeding amount, a moving average value of the current machine speed of the chain grate and a moving average value of kiln tail temperature of the rotary kiln; and obtaining a final coal feeding amount according to the coal feeding amount correction coefficient, limiting the final coal feeding amount, performing closed-loop adjustment on the limited coal feeding amount and temperature, and adjusting the coal feeding amount of the coal feeder within a third preset time period once per hour. It should be noted that, since there is a large time lag time of about 2 minutes from the change of the coal feed amount to the change of the temperature at the kiln tail of the rotary kiln, a moving average value within 2 minutes is obtained for the final coal feed amount Q, and the adjustment frequency for the coal feeder is adjusted once within 2 minutes.
The temperature control method of the pellet rotary kiln provided by the embodiment of the invention is characterized in that the average value of the current material thickness of the chain grate, the real-time feedback value of the coal feeding quantity, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln are respectively valued at intervals of a first preset time, and the values are continuously valued for a plurality of times, and the method comprises the following steps: and respectively taking data for the current average material thickness value of the chain grate, the real-time feedback value of the coal feeding quantity, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln every 5 seconds for mobile storage, and continuously and respectively storing 12 groups of data. And then respectively summing the current material thickness average value of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln and then respectively calculating the average value.
In addition, in the temperature control method of the rotary pelletizing kiln provided in the embodiment of the present invention, the coal supply correction coefficient is obtained according to the moving average value of the current material thickness of the grate, the average value of the real-time feedback value of the coal supply, the moving average value of the current machine speed of the grate, and the moving average value of the kiln tail temperature of the rotary kiln, and includes:
wherein L is cur Is the moving average of the current material thickness of the grate, speed cur Is the moving average of the current machine Speed of the grate, speed cur-1 Is a moving average of the periodic machine speed on the grate, L cur-1 Is a moving average of the material thickness of a cycle on the grate, M cur For entering the kiln tail green weight, M cur-1 Weight of green pellets entering the kiln end for the last cycle, T aim Is the rotary kiln temperature set point, T cur-1 The moving average value of the kiln tail temperature of the rotary kiln in the previous period is shown, and K is a coal feeding quantity correction coefficient.
Specifically, the coal feeding amount correction coefficient k is a real-time change value, and k is calculated according to the last adjustment cycle data, so that the system calculation program can be ensured to carry out self-adaptive adjustment on the change of the coal feeding amount. The method is specifically realized as shown in the formula (1), the factors influencing the temperature regulation of the rotary kiln are stored in a movable mode, and data are stored once per minute due to the fact that the temperature change of the rotary kiln is related to the coal feeding amount, the material thickness of a chain grate, the machine speed of the chain grate and the temperature of the kiln tail and the change has the characteristic of large lag.
Obtaining the final coal feeding amount according to the coal feeding amount correction coefficient, wherein the step comprises the following steps:
Q＝KW cur-1 (2)
wherein Q is the final coal feed amount, W cur-1 The average value of the real-time feedback values of the coal feeding amount in the previous period is obtained.
The temperature control method for the pellet rotary kiln provided by the embodiment of the invention limits the final coal feeding amount, and comprises the following steps: the range of the coal feeding amount set value during normal production is more than or equal to 5 tons/hour and less than or equal to 7 tons/hour, and the coal feeding amount set value is calibrated to prevent misoperation. In another embodiment, the coal feed amount set point when normal production is satisfied is 6 tons/hour, 5.5 tons/hour, 6.5 tons/hour, 5.8 tons/hour, 6.3 tons/hour, or 5.9 tons/hour.
In the temperature control method of the rotary pellet kiln provided by the embodiment of the invention, the closed-loop regulation of the limited coal feeding quantity and temperature comprises the following steps: if T cur -5℃<T aim <T cur +5 ℃, then Q +0.0 ton/h; if T is cur +5℃≤T aim <T cur +10 ℃ and Q-0.1 ton/h; if T is cur +10℃≤T aim <T cur +15 ℃, then Q-0.2 ton/h; if T is cur +15℃≤T aim Q-0.3 ton/h; if T cur -10℃<T aim ≤T cur Q +0.1 ton/h at-5 ℃; if T cur -10℃≤T aim <T cur Q +0.2 ton/h at-15 ℃; if T aim ≤T cur Q +0.3 ton/h at-15 ℃; t is cur Is a moving average of the kiln tail temperature of the rotary kiln. It should be noted that the adjustment values of the final coal supply amount Q are adjustable on the upper computer screen.
After the adjustment of the coal feeding amount per hour of the coal feeder within a third preset time period, the method further comprises the following steps: when the material blockage of the annular cooler occurs, the DCS or the PLC system automatically gives an alarm, an expert is proposed to give an operation worker leader, the command is automatically delayed and sent after the regulation is confirmed or not confirmed, and the rotary kiln is delayed to rotate at a low kiln speed; when the coal feeding amount feedback is smaller than a set value, the DCS or the PLC system automatically gives an alarm, an expert is proposed to give an operation worker leader, a command is automatically sent out in a delayed mode after adjustment or unconfirmation, and the rotary kiln rotates at a low speed in a delayed mode; when the speed of the chain grate machine is less than the set value, the DCS or the PLC system automatically gives an alarm, an expert is provided to give an operation worker leader, the command is automatically delayed and sent out after the regulation is confirmed or not, and the rotary kiln rotates at a low speed in a delayed manner.
The temperature control method of the rotary pellet kiln provided by the embodiment of the invention solves the problems of inaccurate judgment, untimely adjustment and large adjustment range caused by manual experience operation, reduces the labor intensity of operators, improves the labor efficiency, solves the problem that the automatic control of coal feeding amount cannot be implemented due to uncontrollable real-time temperature change, and realizes the automatic temperature control mode of the rotary pellet kiln. The automatic temperature control mode of the pellet rotary kiln is realized; production accidents are avoided and the main control is not monitored in time. The design is fully automatically controlled in DCS/PLC through programs, has safety protection measures and is free from worries in the production process.
The implementation basis of the various embodiments of the present invention is realized by programmed processing performed by a device having a processor function. Therefore, in engineering practice, the technical solutions and functions thereof of the embodiments of the present invention can be packaged into various modules. Based on the actual situation, on the basis of the above embodiments, the embodiments of the present invention provide a pellet rotary kiln temperature control device, which is used for executing the pellet rotary kiln temperature control method in the above method embodiments. Referring to fig. 2, the apparatus includes: the first main module is used for determining a set value of the coal feeding amount of the coal feeder, determining a current material thickness average value of the chain grate, and respectively taking values of the current material thickness average value of the chain grate, a real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln every first preset time, and continuously taking the values for a plurality of times; the second main module is used for respectively summing the current material thickness average value of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln which are obtained by value taking for a plurality of times and then respectively taking a moving average value; the third main module is used for obtaining a coal feeding quantity correction coefficient according to the moving average value of the current material thickness of the chain grate, the average value of the real-time feedback value of the coal feeding quantity, the moving average value of the current machine speed of the chain grate and the moving average value of the kiln tail temperature of the rotary kiln; and the fourth main module is used for obtaining the final coal feeding amount according to the coal feeding amount correction coefficient, limiting the final coal feeding amount, performing closed-loop adjustment on the limited coal feeding amount and temperature, and adjusting the coal feeding amount of the coal feeder within a third preset time period.
The temperature control device of the rotary pellet kiln, provided by the embodiment of the invention, adopts the modules in the figure 2, solves the problems of inaccurate judgment, untimely adjustment and large adjustment range caused by manual experience operation, reduces the labor intensity of operators, improves the labor efficiency, solves the problem that the automatic control of the coal feeding amount cannot be implemented due to uncontrollable real-time temperature change, and realizes the automatic temperature control mode of the rotary pellet kiln.
It should be noted that, the apparatus in the apparatus embodiment provided by the present invention may be used for implementing methods in other method embodiments provided by the present invention, except that corresponding function modules are provided, and the principle of the apparatus embodiment provided by the present invention is basically the same as that of the apparatus embodiment provided by the present invention, so long as a person skilled in the art obtains corresponding technical means by combining technical features on the basis of the apparatus embodiment described above, and obtains a technical solution formed by these technical means, on the premise of ensuring that the technical solution has practicability, the apparatus in the apparatus embodiment described above may be modified, so as to obtain a corresponding apparatus class embodiment, which is used for implementing methods in other method class embodiments. For example:
the temperature control device of the rotary pellet kiln provided by the embodiment of the invention also comprises: the first submodule is used for realizing that values are respectively taken for the current material thickness average value of the chain grate, the real-time feedback value of the coal feeding quantity, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln every other first preset time, and the values are continuously taken for a plurality of times, and comprises: and respectively taking data for the current average material thickness of the chain grate, the real-time feedback value of the coal feeding quantity, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln at intervals of 5 seconds for mobile storage, and continuously and respectively storing 12 groups of data.
The temperature control device for the pellet rotary kiln provided by the embodiment of the invention further comprises: the second submodule is used for realizing that the coal feeding quantity correction coefficient is obtained according to the moving average value of the current material thickness of the chain grate, the average value of the real-time feedback value of the coal feeding quantity, the moving average value of the current machine speed of the chain grate and the moving average value of the kiln tail temperature of the rotary kiln, and comprises the following steps:
wherein L is cur Is the moving average of the current material thickness of the grate, speed cur Is the moving average of the current machine Speed of the grate, speed cur-1 Is a moving average of the periodic machine speed on the grate, L cur-1 Is a moving average of the cycle material thickness on the chain grate, M cur For entering the kiln tail green weight, M cur-1 Weight of green pellets entering the kiln end for the previous cycle, T aim Is the rotary kiln temperature set point, T cur-1 The moving average value of the kiln tail temperature of the rotary kiln in the previous period is shown, and K is a coal feeding quantity correction coefficient.
The temperature control device for the pellet rotary kiln provided by the embodiment of the invention further comprises: the third submodule is used for realizing that the final coal feeding amount is obtained according to the coal feeding amount correction coefficient and comprises:
Q＝KW cur-1
wherein Q is the final coal feed amount, W cur-1 The average value of the real-time feedback values of the coal feeding amount in the last period is obtained.
The temperature control device for the pellet rotary kiln provided by the embodiment of the invention further comprises: the fourth sub-module is used for limiting the final coal feeding amount and comprises the following steps: the range of the coal feeding amount set value during normal production is more than or equal to 5 tons/hour and less than or equal to 7 tons/hour, and the coal feeding amount set value is calibrated to prevent misoperation.
Based on the content of the above device embodiment, as an optional embodiment, the temperature control device for a pellet rotary kiln provided in the embodiment of the present invention further includes: a fifth sub-module, configured to implement the closed-loop adjustment of the limited coal feeding amount and temperature, including: if T cur -5℃<T aim <T cur +5 ℃ and Q +0.0 ton/hour; if T cur +5℃≤T aim <T cur +10 ℃ and Q-0.1 ton/h; if T cur +10℃≤T aim <T cur +15 ℃ and Q-0.2 ton/h; if T cur +15℃≤T aim Q-0.3 ton/h; if T is cur -10℃<T aim ≤T cur Q +0.1 ton/h at-5 ℃; if T cur -10℃≤T aim <T cur Q +0.2 ton/h at-15 ℃; if T is aim ≤T cur Q +0.3 ton/h at-15 ℃; t is a unit of cur Is a moving average of the kiln tail temperature of the rotary kiln.
The temperature control device of the rotary pellet kiln provided by the embodiment of the invention also comprises: a sixth submodule for enabling adjustment of the coal feed rate to the coal feeder after said adjustment has been made within a third predetermined time period, further comprising: when the annular cooler is blocked, the DCS or the PLC system automatically gives an alarm, an expert is provided to give an operation worker leader, a command is automatically delayed and sent after adjustment is confirmed or not confirmed, and the rotary kiln is delayed to rotate at a low kiln speed; when the coal feeding amount feedback is smaller than a set value, the DCS or the PLC system automatically gives an alarm, an expert is provided to give an operation worker leader, a command is automatically delayed and sent out after adjustment is confirmed or not confirmed, and the rotary kiln is delayed to rotate at a low kiln speed; when the speed of the chain grate machine is less than the set value, the DCS or the PLC system automatically gives an alarm, an expert is provided to give an operation worker leader, the command is automatically delayed and sent out after the regulation is confirmed or not, and the rotary kiln rotates at a low speed in a delayed manner.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. Based on this recognition, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" comprises 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A temperature control method of a pellet rotary kiln is characterized by comprising the following steps:
determining a set value of coal feeding quantity of a coal feeder, determining a current material thickness average value of a chain grate, and taking values of the current material thickness average value of the chain grate, a real-time feedback value of the coal feeding quantity, the current machine speed of the chain grate and the kiln tail temperature of a rotary kiln every other first preset time, wherein the values are continuously taken for a plurality of times;
respectively summing the average value of the current material thickness of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln obtained by the value taking for a plurality of times, and then respectively taking a moving average value;
obtaining a coal feeding amount correction coefficient according to a moving average value of the current material thickness of the chain grate, an average value of real-time feedback values of the coal feeding amount, a moving average value of the current machine speed of the chain grate and a moving average value of kiln tail temperature of the rotary kiln;
and obtaining a final coal feeding amount according to the coal feeding amount correction coefficient, limiting the final coal feeding amount, performing closed-loop adjustment on the limited coal feeding amount and temperature, and adjusting the coal feeding amount of the coal feeder within a third preset time period every hour.
2. The temperature control method for the pellet rotary kiln as claimed in claim 1, wherein the values of the average value of the current material thickness of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln are respectively taken every first predetermined time, and the values are continuously taken for a plurality of times, and the method comprises the following steps: and respectively taking data for the current average material thickness of the chain grate, the real-time feedback value of the coal feeding quantity, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln at intervals of 5 seconds for mobile storage, and continuously and respectively storing 12 groups of data.
3. The method for controlling the temperature of the pellet rotary kiln as claimed in claim 2, wherein the obtaining of the coal feeding amount correction coefficient according to the moving average of the current material thickness of the grate, the average of the real-time feedback value of the coal feeding amount, the moving average of the current machine speed of the grate and the moving average of the kiln tail temperature of the rotary kiln comprises:
wherein L is cur Is the moving average of the current material thickness of the grate, speed cur Is the moving average of the current machine Speed of the grate, speed cur-1 Is a moving average of the cycle speed on the grate, L cur-1 Is a moving average of the cycle material thickness on the chain grate, M cur For entering the kiln tail green weight, M cur-1 Weight of green pellets entering the kiln end for the previous cycle, T aim Is the rotary kiln temperature set point, T cur-1 The average value of the kiln tail temperature of the rotary kiln in the last period is shown, and K is a coal feeding quantity correction coefficient.
4. The method for controlling the temperature of a pellet rotary kiln as claimed in claim 3, wherein the obtaining of the final coal feeding amount according to the coal feeding amount correction coefficient comprises:
Q＝KW cur-1
wherein Q is the final coal feed, W cur-1 The average value of the real-time feedback values of the coal feeding amount in the last period is obtained.
5. The pellet rotary kiln temperature control method of claim 4, wherein the final coal feed rate limiting comprises: the range of the coal feeding amount set value during normal production is more than or equal to 5 tons/hour and less than or equal to 7 tons/hour, and the coal feeding amount set value is calibrated to prevent misoperation.
6. The method for controlling the temperature of the pellet rotary kiln as claimed in claim 5, wherein the closed-loop adjustment of the limited coal feeding amount and the limited temperature comprises: if T cur -5℃<T aim <T cur +5 ℃ and Q +0.0 ton/hour; if T is cur +5℃≤T aim <T cur +10 ℃ and Q-0.1 ton/h; if T is cur +10℃≤T aim <T cur +15 ℃ and Q-0.2 ton/h; if T cur +15℃≤T aim Q-0.3 ton/h; if T cur -10℃<T aim ≤T cur Q +0.1 ton/h at-5 ℃; if T cur -10℃≤T aim <T cur Q +0.2 ton/h at-15 ℃; if T aim ≤T cur Q +0.3 ton/h at-15 ℃; t is cur Is the moving average value of the kiln tail temperature of the rotary kiln.
7. The pellet rotary kiln temperature control method of claim 6, further comprising, after the hourly coal feed to the coal feeder is adjusted within a third predetermined time period: when the material blockage of the annular cooler occurs, the DCS or the PLC system automatically gives an alarm, an expert is proposed to give an operation worker leader, the command is automatically delayed and sent after the regulation is confirmed or not confirmed, and the rotary kiln is delayed to rotate at a low kiln speed; when the coal feeding amount feedback is smaller than a set value, the DCS or the PLC system automatically gives an alarm, an expert is proposed to give an operation worker leader, a command is automatically sent out in a delayed mode after adjustment or unconfirmation, and the rotary kiln rotates at a low speed in a delayed mode; when the speed of the chain grate machine is less than the set value, the DCS or the PLC system automatically gives an alarm, an expert is provided to give an operation worker leader, the command is automatically delayed and sent out after the regulation is confirmed or not, and the rotary kiln rotates at a low speed in a delayed manner.
8. A pellet rotary kiln temperature control device is characterized by comprising:
the first main module is used for determining a set value of the coal feeding amount of the coal feeder, determining a current material thickness average value of the chain grate, and respectively taking values of the current material thickness average value of the chain grate, a real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln every first preset time, and continuously taking the values for a plurality of times;
the second main module is used for respectively summing the current material thickness average value of the chain grate, the real-time feedback value of the coal feeding amount, the current machine speed of the chain grate and the kiln tail temperature of the rotary kiln which are obtained by the value taking for a plurality of times and then respectively taking a moving average value;
the third main module is used for obtaining a coal feeding quantity correction coefficient according to the moving average value of the current material thickness of the chain grate, the average value of the real-time feedback value of the coal feeding quantity, the moving average value of the current machine speed of the chain grate and the moving average value of the kiln tail temperature of the rotary kiln;
and the fourth main module is used for obtaining the final coal feeding amount according to the coal feeding amount correction coefficient, limiting the final coal feeding amount, performing closed-loop adjustment on the limited coal feeding amount and temperature, and adjusting the coal feeding amount of the coal feeder within a third preset time period.
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